I took a look at all the achievements and most of not all of them use conditions that only work by chance, and as usual they will only work for Player 1 and not for Player 2...

All the endings use the address 0x187a, which has a weird value, unless it was like the dialogue ID, it makes no sense at all. Instead it should use these 2 addresses 0x18ca & 0x18cb, which ARE related to the ending.

I still say the 4-star one should be restored and fixed: It's not fair that the people who did it lost it when it's a reasonable challenge: Just lower its point value (make it 5 or 10) and make this the big kahuna.